R 连接向量中的相邻字符串

给定

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zlab格式完全正确，最终在绘图上显示为标签。但是生成zlab真的很难看。我可以用更优雅的方式来做这件事吗？

head

和

tail

为您提供需要粘贴的分位数切片

zlab
[1] "$1.00 - $2.80"  "$2.80 - $4.60"  "$4.60 - $6.40"  "$6.40 - $8.20"  "$8.20 - $10.00"

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x分位数标签应用于该图（带有实际数据）。谢谢你优雅的解决方案。
zlab <- c(paste(paste(sprintf(qz[[1]], fmt='$%.2f'), "-"), sprintf(qz[2],
fmt='$%.2f')), paste(paste(sprintf(qz[[2]], fmt='$%.2f'), "-"), sprintf(qz[3],
fmt='$%.2f')),paste(paste(sprintf(qz[[3]], fmt='$%.2f'), "-"), sprintf(qz[4],
fmt='$%.2f')), paste(paste(sprintf(qz[[4]], fmt='$%.2f'), "-"), sprintf(qz[5],
fmt='$%.2f')), paste(paste(sprintf(qz[[5]], fmt='$%.2f'), "-"), sprintf(qz[6],
fmt='$%.2f')))

zlab
[1] "$1.00 - $2.80"  "$2.80 - $4.60"  "$4.60 - $6.40"  "$6.40 - $8.20"  "$8.20 - $10.00"

x <- sprintf("$%.2f", qz)
x
## [1] "$1.00"  "$2.80"  "$4.60"  "$6.40"  "$8.20"  "$10.00"

paste(head(x, -1), tail(x, -1), sep=' - ')
## [1] "$1.00 - $2.80"  "$2.80 - $4.60"  "$4.60 - $6.40"  "$6.40 - $8.20"  "$8.20 - $10.00"